Setting The Pre-Pressure Of The Expansion Vessel; Connecting The Water Circuit; Charging Water; Piping Insulation - Rotex RKHBH008BB3V3 Manuel D'installation

Example 2
The indoor unit is installed at the highest point in the water circuit.
The total water volume in the water circuit is 350 l.
Result:
■
Since 350 l is higher than 280 l, the pre-pressure must be
decreased (see table above).
■
The required pre-pressure is:
Pg = (H/10 + 0.3) bar = (0/10 + 0.3) bar = 0.3 bar
■
The corresponding maximum water volume can be read from
the graph: approximately 410 l.
■
Since the total water volume (350 l) is below the maximum water
volume (410 l), the expansion vessel suffices for the installation.

Setting the pre-pressure of the expansion vessel

When it is required to change the default pre-pressure of the
expansion vessel (1 bar), keep in mind the following guidelines:
■
Use only dry nitrogen to set the expansion vessel pre-pressure.
■
Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by an installer.

Connecting the water circuit

Water connections must be made in accordance with the applicable
legislation and the outlook diagram delivered with the unit, respecting
the water in- and outlet.
NOTICE
Be careful not to deform the unit piping by using excessive
force when connecting the piping. Deformation of the
piping can cause the unit to malfunction.

6.9. Charging water

1 Connect the water supply to a drain and fill valve (see "5.2. Main
components" on page 10).
2 Make sure the automatic air purge valve is open (at least 2
turns).
3 Fill with water until the manometer indicates a pressure of
approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves. Air present in the water
circuit might cause malfunctioning of the backup heater.
4 Check that the backup heater vessel is filled with water by
opening the pressure relief valve. Water must flow out of the
valve.
INFORMATION
■
During filling, it might not be possible to remove all air
in the system. Remaining air will be removed through
the automatic air purge valves during first operating
hours of the system. Additional filling with water
afterwards might be required.
■
The water pressure indicated on the manometer will
vary depending on the water temperature (higher
pressure at higher water temperature).
However, at all times water pressure should remain
above 0.3 bar to avoid air entering the circuit.
■
The unit might dispose some excessive water through
the pressure relief valve.
■
Water quality must be according to EU directive 98/
83 EC.
Installation manual
17

6.10. Piping insulation

The complete water circuit, inclusive all piping, must be insulated to
prevent condensation during cooling operation and reduction of the
heating and cooling capacity.
If the temperature is higher than 30°C and the humidity is higher than
RH 80%, then the thickness of the sealing materials should be at
least 20 mm in order to avoid condensation on the surface of the
sealing.
7. E
LECTRICAL WIRING WORK

7.1. Precautions on electrical wiring work

WARNING: Electrical installation
All field wiring and components must be installed by an
installer and must comply with the applicable legislation
NOTICE: Electrical wiring work recommendations.
To persons in charge of electrical wiring work:
Do not operate the unit until the refrigerant piping is
complete. Running the unit before the piping is ready will
break the compressor.
DANGER: ELECTRICAL SHOCK
See "2. General safety precautions" on page 2.
WARNING
■
A main switch or other means for disconnection,
having a contact separation in all poles, must be
incorporated in the fixed wiring in accordance with the
applicable legislation.
■
Use only copper wires.
■
All field wiring must be carried out in accordance with
the wiring diagram supplied with the unit and the
instructions given below.
■
Never squeeze bundled cables and be sure that it
does not come in contact with the non-insulated
piping and sharp edges. Be sure no external pressure
is applied to the terminal connections.
■
Power supply wires must be attached securely.
■
If the power supply has a missing or wrong N-phase,
equipment will break down.
■
Be sure to establish an earth. Do not earth the unit to
a utility pipe, surge absorber, or telephone earth.
Incomplete earth may cause electrical shock.
■
Be sure to install an earth leakage protector in
accordance with the applicable legislation. Failure to
do so may cause electric shock or fire.
■
Be sure to use a dedicated power circuit, never use a
power supply shared by another appliance.
■
Be sure to install the required fuses or circuit
breakers.
Indoor unit for air to water heat pump system
RKHBH/X008BB
4PW62574-1 – 10.2010